Whilst the fork crown is drilled out, It came equipped as a track bike (Bruce?) but framewise it's could be either/or !
Percy Stallard sold out-and-out track bikes under the name "Championship Path" for obvious reasons in the days when most riders rode the one machine they owned for all purposes not just the once a week track meet. Yet they were real velodrome machines. Personal economics today and the ability to afford more than one lightweight machine seems to be the only difference.
As far as grass track is concerned, see this page -
Thanks to Bruce and friends of the Dundee Coup.